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vertexTracerTool.py
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vertexTracerTool.py
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# -*- coding: utf-8 -*-
# AutoTrace - An editing tool for QGIS that allows users to 'trace' new
# feature geometry based on existing features.
# Copyright (C) 2012 Peter Wells for Lutra Consulting
# Based on traceDigitize by Cédric Möri with lots of stuff from Stefan
# Ziegler (CAD-Tools)
# peter dot wells at lutraconsulting dot co dot uk
# Lutra Consulting
# 23 Chestnut Close
# Burgess Hill
# West Sussex
# RH15 8HN
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
"""
Behavior of the auto method of tracing:
*cursor is within snapable distance of a vertice with the shift key goes down
onMouseMove:
Remove any uncommitted vertices from the rubber band
If shift is down:
call proposeRBUpdate()
onShiftKeyGoingDown:
call proposeRBUpdate()
onShistKeyComingUp:
Remove any uncommitted vertices from the rubber band
Function proposeRBUpdate():
If the last point in the RB is snapped to a feature:
If we're currently snapping to the same feature:
Determine the vertices that make the shortest path between v1 and v2
Add them as uncommitted vertices to the rb
If the left button is clicked and the shift key is down:
Unmark any vertices marked as preliminary
High level
==========
When the user presses shift and hovers over a vertice, the rubber-band
should update to show the auto-traced path around the
"""
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from qgis.core import *
from qgis.gui import *
# Vertex Finder Tool class
class VertexTracerTool(QgsMapTool):
def __init__(self, canvas):
QgsMapTool.__init__(self,canvas)
self.canvas=canvas
self.started = False
self.snapper = QgsMapCanvasSnapper(self.canvas)
self.snapIndicator = None
self.mCtrl = False
self.mShift = False
self.lastPoint = None
self.pointsProposed = False
self.propVertCnt = 0
self.snappedLayer = None
self.snappedGeometry = None
self.snappedVertexNr = None
self.snappedPartNr = None
self.snappedRingNr = None
self.snappedRingVertexOffset = None
self.snappedToPolygon = False
self.rb = QgsRubberBand(self.canvas, QGis.Line)
self.autoCursor = QCursor(QPixmap(["16 16 3 1",
" c None",
". c #FF00FF",
"+ c #FFFFFF",
" ",
" +.+ ",
" ++.++ ",
" +.....+ ",
" +. .+ ",
" +. . .+ ",
" +. . .+ ",
" ++. . .++",
" ... ...+... ...",
" ++. . .++",
" +. . .+ ",
" +. . .+ ",
" ++. .+ ",
" ++.....+ ",
" ++.++ ",
" +.+ "]))
def setupRubberBand(self):
s = QSettings()
rb_w = s.value("/qgis/digitizing/line_width", 1, type=int)
rb_r = s.value("/qgis/digitizing/line_color_red", 255, type=int)
rb_g = s.value("/qgis/digitizing/line_color_green", 0, type=int)
rb_b = s.value("/qgis/digitizing/line_color_blue", 0, type=int)
rb_a = s.value("/qgis/digitizing/line_color_alpha", 200, type=int)
self.rb.setColor(QColor(rb_r, rb_g, rb_b, rb_a))
self.rb.setWidth(rb_w)
def proposeRBUpdate(self, event=None):
"""
Pop the last vert off the rb (the current mouse position)
Push our proposed ones on
Make not of how many proposed verts were added (propVertCnt)
Push back the last vert
"""
if self.started:
# We have to do our capturing of mouse coords here else we just end up popping the same point off and on again if moving
# i.e. the cursor doesn't follow the mouse
if self.snappedLayer is None:
return
newMouseP = None
retval = 0
snapResults = []
if event is not None:
x = event.pos().x()
y = event.pos().y()
newMouseP = QgsMapToPixel.toMapCoordinates(self.canvas.getCoordinateTransform (), x, y)
eventPoint = QPoint(x,y)
(retval,snapResults) = self.snapper.snapToBackgroundLayers(eventPoint)
else:
x = self.canvas.mouseLastXY().x()
y = self.canvas.mouseLastXY().y()
vertCount = self.rb.numberOfVertices()
#newMouseP = QgsPoint( self.rb.getPoint( 0, vertCount - 1 ) )
(retval,snapResults) = self.snapper.snapToBackgroundLayers( QPoint(x,y) )
if len(snapResults) < 1:
# There was nothing to snap to here, just update the end of the rb
self.clearSnapIndicator()
point = QgsMapToPixel.toMapCoordinates(self.canvas.getCoordinateTransform (), x, y)
self.rb.movePoint(point)
return
else:
self.updateSnapIndicator(snapResults[0].snappedVertex)
part, ring = self.getPartAndRing(snapResults[0].layer, snapResults[0].snappedAtGeometry, snapResults[0].snappedVertexNr)
if snapResults[0].layer <> self.snappedLayer or \
snapResults[0].snappedAtGeometry <> self.snappedGeometry or \
self.snappedPartNr != part or \
self.snappedRingNr != ring:
# We snapped to something but we can't do anything fancy with it
self.rb.movePoint(snapResults[0].snappedVertex)
return
# By this point, we should be snapping to the same layer and geomtry as last time (so we can now
# calculate paths between the two points
self.rb.removeLastPoint()
# Now determine the points that we need to add
newVerts = self.getAdditionalVerts( snapResults[0].snappedVertexNr )
f = QgsFeature()
self.snappedLayer.getFeatures(QgsFeatureRequest(self.snappedGeometry)).nextFeature(f)
for newVert in newVerts:
if self.snappedToPolygon:
v = f.geometry().vertexAt(newVert)
else:
v = f.geometry().vertexAt(newVert)
v = self.canvas.mapRenderer().layerToMapCoordinates(self.snappedLayer, v)
self.rb.addPoint(v,False)
self.propVertCnt += 1
self.pointsProposed = True
self.rb.update()
self.rb.addPoint(snapResults[0].snappedVertex)
def getAdditionalVerts( self, secondVertexNr ):
"""
For a given geometry (even multi-part polygons) determien the
shortest (or longest) route between:
self.snappedVertexNr
and
secondVertexNr
on
self.snappedGeometry
Are they both the same vertice?
Are they really the same vertice (0 and 4 in a square)
"""
firstVertexNr = self.snappedVertexNr
firstVertexNr -= self.snappedRingVertexOffset
secondVertexNr -= self.snappedRingVertexOffset
if firstVertexNr == secondVertexNr:
return []
largerNr = max(firstVertexNr,secondVertexNr)
smallerNr = min(firstVertexNr,secondVertexNr)
f = QgsFeature()
self.snappedLayer.getFeatures(QgsFeatureRequest(self.snappedGeometry)).nextFeature(f)
if not f.geometry().isMultipart():
if f.geometry().type() == QGis.Line:
vertCount = len( f.geometry().asPolyline() )
else:
vertCount = len( f.geometry().asPolygon()[self.snappedRingNr] )
else:
if f.geometry().type() == QGis.Line:
vertCount = len( f.geometry().asMultiPolyline()[self.snappedPartNr] )
else:
vertCount = len( f.geometry().asMultiPolygon()[self.snappedPartNr][self.snappedRingNr] )
if self.snappedToPolygon:
if ((firstVertexNr == vertCount-1) and (secondVertexNr == 0)) or ((secondVertexNr == vertCount-1) and (firstVertexNr == 0)):
return []
if self.snappedToPolygon:
# Determine which route is shorter
joinFaster = False
normalDistance = largerNr - smallerNr
joinDistance = (vertCount - largerNr - 1) + smallerNr
if joinDistance < normalDistance:
joinFaster = True
if self.mCtrl:
joinFaster = not(joinFaster)
if joinFaster:
if secondVertexNr > firstVertexNr:
a = range(firstVertexNr-1,-1,-1)
b = range(vertCount-2,secondVertexNr,-1)
a.extend(b)
return [x+self.snappedRingVertexOffset for x in a]
else:
a = range(firstVertexNr+1,vertCount,1)
b = range(1,secondVertexNr,1)
a.extend(b)
return [x+self.snappedRingVertexOffset for x in a]
# else if jointFaster is not true
if secondVertexNr > firstVertexNr:
newverts = range(firstVertexNr+1,secondVertexNr,1)
return [x+self.snappedRingVertexOffset for x in newverts]
else:
newverts = range(firstVertexNr-1,secondVertexNr,-1)
return [x+self.snappedRingVertexOffset for x in newverts]
def acceptProposedRBUpdate(self):
self.propVertCnt = 0
self.pointsProposed = False
def revertProposedRBUpdate(self):
"""
Pop the last vert off the rb
Pop off and discard propVertCnt vertices
Push the last vert back on again
"""
if self.pointsProposed:
mouseP = QgsPoint( self.rb.getPoint( 0, self.rb.numberOfVertices()-1 ) )
self.rb.removeLastPoint()
for i in range(self.propVertCnt):
self.rb.removeLastPoint()
self.rb.addPoint(mouseP)
self.propVertCnt = 0
self.pointsProposed = False
def keyPressEvent(self, event):
if event.key() == Qt.Key_Control:
self.mCtrl = True
if self.mShift:
self.revertProposedRBUpdate()
self.proposeRBUpdate()
if event.key() == Qt.Key_Shift:
self.mShift = True
self.proposeRBUpdate()
def keyReleaseEvent(self, event):
if event.key() == Qt.Key_Control:
self.mCtrl = False
if self.mShift:
self.revertProposedRBUpdate()
self.proposeRBUpdate()
if event.key() == Qt.Key_Shift:
self.mShift = False
self.revertProposedRBUpdate()
#remove the last added point when the delete key is pressed
if event.key() == Qt.Key_Backspace:
self.removeLastPoint()
def removeLastPoint(self):
if self.rb.numberOfVertices() > 0:
self.rb.removeLastPoint()
rbVertCount = self.rb.numberOfVertices()
if rbVertCount >= 2:
lastPoint = self.rb.getPoint(0, rbVertCount-2)
lastPointOnScreen = self.canvas.getCoordinateTransform().transform(lastPoint)
retval, snapResults = self.snapper.snapToBackgroundLayers(QPoint( lastPointOnScreen.x(), lastPointOnScreen.y()))
if len(snapResults) > 0:
self.updateDetailsOfLastSnap(snapResults[0])
else:
self.updateDetailsOfLastSnap()
else:
self.updateDetailsOfLastSnap()
def canvasPressEvent(self,event):
#on left click, we add a point
if event.button() == Qt.LeftButton:
layer = self.canvas.currentLayer()
if not layer:
return
#if it the start of a new trace, set the rubberband up
if self.started == False:
self.rb.reset(layer.geometryType())
self.setupRubberBand()
self.lastPoint = None
self.started = True
self.acceptProposedRBUpdate()
if layer <> None:
#if self.mCtrl == False:
x = event.pos().x()
y = event.pos().y()
selPoint = QPoint(x,y)
(retval,result) = self.snapper.snapToBackgroundLayers(selPoint)
#the point is either from snapping result
if result <> []:
point = result[0].snappedVertex
self.updateDetailsOfLastSnap(result[0])
#or just a plain point
else:
point = QgsMapToPixel.toMapCoordinates(self.canvas.getCoordinateTransform (), x, y)
self.updateDetailsOfLastSnap()
self.appendPoint(QgsPoint(point))
def getPartAndRing(self, layer, featureId, snappedVertNr):
""" Return the index of the part and ring that snappedVertNr exists
in. Lines will always have ring=0. """
f = QgsFeature()
layer.getFeatures(QgsFeatureRequest(featureId)).nextFeature(f)
geom = f.geometry()
snapGeom = QgsGeometry().fromPoint( geom.vertexAt(snappedVertNr) )
if not geom.isMultipart():
if geom.type() == QGis.Line:
# If it was not snapped to this line, we wouldn't even be here
self.snappedRingVertexOffset = 0
return 0, 0
elif geom.type() == QGis.Polygon:
ringId = 0
vertOffset = 0
for ring in geom.asPolygon():
if ringId > 0:
vertOffset += lastRingLen
ringGeom = QgsGeometry().fromPolyline( ring )
if snapGeom.intersects(ringGeom):
self.snappedRingVertexOffset = vertOffset
return 0, ringId
ringId += 1
lastRingLen = len(ring)
self.snappedRingVertexOffset = 0
return 0, 0 # We should not get here
else:
self.snappedRingVertexOffset = 0
return 0, 0
else:
# Multipart
if geom.type() == QGis.Line:
partId = 0
vertOffset = 0
for part in geom.asMultiPolyline():
if partId > 0:
vertOffset += lastLineLength
lineGeom = QgsGeometry().fromPolyline( part )
if lineGeom.intersects(snapGeom):
self.snappedRingVertexOffset = vertOffset
return partId, 0
partId += 1
lastLineLength = len(part)
return 0, 0 # We should not get here
elif geom.type() == QGis.Polygon:
partId = 0
vertOffset = 0
for part in geom.asMultiPolygon():
ringId = 0
for ring in part:
if partId > 0 or ringId > 0:
vertOffset += lastRingLen
ringGeom = QgsGeometry().fromPolyline( ring )
if snapGeom.intersects(ringGeom):
self.snappedRingVertexOffset = vertOffset
return partId, ringId
ringId += 1
lastRingLen = len(ring)
partId += 1
self.snappedRingVertexOffset = 0
return 0, 0 # We should not get here
else:
self.snappedRingVertexOffset = 0
return 0, 0
def updateDetailsOfLastSnap(self, snappingResult=None):
if snappingResult is not None:
self.snappedLayer = snappingResult.layer
self.snappedGeometry = snappingResult.snappedAtGeometry
self.snappedVertexNr = snappingResult.snappedVertexNr
part, ring = self.getPartAndRing(self.snappedLayer, self.snappedGeometry, self.snappedVertexNr)
self.snappedPartNr = part
self.snappedRingNr = ring
if self.snappedLayer.geometryType() == 2:
self.snappedToPolygon = True
else:
self.snappedToPolygon = False
else:
self.snappedLayer = None
self.snappedGeometry = None
self.snappedVertexNr = None
self.snappedPartNr = None
self.snappedRingNr = None
self.snappedRingVertexOffset = None
self.snappedToPolygon = False
def initialiseSnapIndicator(self, position):
self.snapIndicator = QgsVertexMarker(self.canvas)
self.snapIndicator.setIconType(QgsVertexMarker.ICON_CROSS)
self.snapIndicator.setIconSize(20)
self.snapIndicator.setColor( QColor(85,85,85) )
self.snapIndicator.setPenWidth(1)
def updateSnapIndicator(self, newPosition):
if self.snapIndicator == None:
self.initialiseSnapIndicator(newPosition)
else:
self.snapIndicator.setCenter(newPosition)
def clearSnapIndicator(self):
if self.snapIndicator != None:
self.canvas.scene().removeItem(self.snapIndicator)
self.snapIndicator = None
def canvasMoveEvent(self,event):
x = event.pos().x()
y = event.pos().y()
eventPoint = QPoint(x,y)
if self.started:
if self.mShift and self.snappedLayer is not None:
self.revertProposedRBUpdate()
self.proposeRBUpdate(event)
else:
# If there is a snapable point nearby, move the end of the rb to it
(retval,result) = self.snapper.snapToBackgroundLayers(eventPoint)
if result <> []:
self.rb.movePoint(result[0].snappedVertex)
self.updateSnapIndicator(result[0].snappedVertex)
else:
point = QgsMapToPixel.toMapCoordinates(self.canvas.getCoordinateTransform (), x, y)
self.rb.movePoint(point)
self.clearSnapIndicator()
# Display the snap indicator even if we have not yet started
else:
(retval,result) = self.snapper.snapToBackgroundLayers(eventPoint)
if len(result) > 0:
self.updateSnapIndicator(result[0].snappedVertex)
else:
self.clearSnapIndicator()
def canvasReleaseEvent(self, event):
#with right click the digitizing is finished
if self.mShift:
# User can only finish digitising when they are not holding down shift
return
if event.button() == Qt.RightButton:
if self.canvas.currentLayer() and self.started == True:
self.sendGeometry()
#remember that this trace is finished, the next left click starts a new one
self.started = False
self.clearSnapIndicator()
def appendPoint(self, point):
#don't add the point if it is identical to the last point we added
if (self.lastPoint <> point) :
self.rb.addPoint(point)
self.lastPoint = point
def sendGeometry(self):
layer = self.canvas.currentLayer()
coords = []
#backward compatiblity for a bug in qgsRubberband, that was fixed in 1.7
if QGis.QGIS_VERSION_INT >= 10700:
#[coords.append(self.rb.getPoint(0, i)) for i in range(self.rb.numberOfVertices())]
[ coords.append(self.rb.getPoint(0, i)) for i in range(self.rb.numberOfVertices()-1) ] # PW Fix for duplicate final vertice when adding lines
else:
[coords.append(self.rb.getPoint(0,i)) for i in range(1,self.rb.numberOfVertices())]
## On the Fly reprojection.
layerEPSG = layer.crs().authid()
projectEPSG = self.canvas.mapRenderer().destinationCrs().authid()
if layerEPSG != projectEPSG:
coords_tmp = coords[:]
coords = []
for point in coords_tmp:
transformedPoint = self.canvas.mapRenderer().mapToLayerCoordinates( layer, point );
coords.append(transformedPoint)
coords_tmp = coords[:]
coords = []
lastPt = None
for pt in coords_tmp:
if (lastPt <> pt) :
coords.append(pt)
lastPt = pt
## Add geometry to feature.
if layer.geometryType() == QGis.Polygon:
g = QgsGeometry().fromPolygon([coords])
else:
g = QgsGeometry().fromPolyline(coords)
self.emit(SIGNAL("traceFound(PyQt_PyObject)"),g)
#self.emit(SIGNAL("traceFound(PyQt_PyObject)"),self.rb.asGeometry())
self.rb.reset(layer.geometryType())
def activate(self):
self.canvas.setCursor(self.autoCursor)
def deactivate(self):
try:
self.rb.reset()
except AttributeError:
pass
def isZoomTool(self):
return False
def isTransient(self):
return False
def isEditTool(self):
return True